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is the process of exchange of information between sender and receiver which is
of two types wired and wireless wire less communication is also known as tele
communication . As per the wire less technologies we have various generations
like 1G, 2G, 3G, 4G, 5g

is the first generation wireless telephone technology in was introduced in
1980s, NMT(Nordic mobile telephony),TACS(total access communication system)   ,ETACS(European
total access communication system) started wireless communication in  1G the speed was up to 2.4kbps ,it

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voice calls in one country  analog
signals are preffered in this generation As analog signals canot be transferred
to a long distance made raise to new generation 2G

uses digital technology in which analog signals are converted to digital and vise
versa which can cover up a long distance.GSM is the technology is introduced
for wireless voice communication for data accesss we went to 2.5G technology
data speed was upto 64kbps It provides services like text messages ,picture messages
2.5G In this  technology gprs is
introduced for data transmission but data rate is low(56.64kbps) hence we moved
to 2.75G2.75G  EDGE(enhanced data rate
for gsm technology) developed here data rate is 170kbps 2G,2.5G,2.75G combindly
known as 2G technology

(UMTS)  universal mobile terrestrial
system which gives data rate of 384kbps which also provide us videos calling
this increased bandwidth and introduced web applications It provides faster
communication in sending and receving messages .cost is the major draw back and
it increased phone size

1gbps data rate for stationery users and 100mbps for high

Mobility users we need higher data rate when we move in bullet trainsNow
our target is 5G (10gbps ), it includes features like  high speed data access and high quality streaming
video , it combind stuff of wi-fi and wi-max, more 

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